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From: Mergen Imeev via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH v2 3/4] sql: introduce mem_cmp_scalar()
Date: Tue, 13 Jul 2021 11:04:07 +0300
Message-ID: <20210713080407.GA104775@tarantool.org> (raw)
In-Reply-To: <c2ac86e9-61dd-99ad-e7b3-c8a7d5997c04@tarantool.org>

Hi! Thank you for the review! My answer, diff and new patch below.

On Mon, Jul 12, 2021 at 11:06:03PM +0200, Vladislav Shpilevoy wrote:
> Hi! Thanks for the fixes!
> 
> >>> +static inline enum mem_class
> >>> +mem_type_class(enum mem_type type)
> >>> +{
> >>> +	switch (type) {
> >>> +	case MEM_TYPE_NULL:
> >>> +		return MEM_CLASS_NULL;
> >>> +	case MEM_TYPE_UINT:
> >>> +	case MEM_TYPE_INT:
> >>> +	case MEM_TYPE_DOUBLE:
> >>> +		return MEM_CLASS_NUMBER;
> >>> +	case MEM_TYPE_STR:
> >>> +		return MEM_CLASS_STR;
> >>> +	case MEM_TYPE_BIN:
> >>> +		return MEM_CLASS_BIN;
> >>> +	case MEM_TYPE_BOOL:
> >>> +		return MEM_CLASS_BOOL;
> >>> +	case MEM_TYPE_UUID:
> >>> +		return MEM_CLASS_UUID;
> >>
> >> 3. It might work faster without branching if done like
> >> 'static enum mp_class mp_classes[]' - would allow to take
> >> the class for any type as simple as an array access
> >> operation.
> > This cannot be done directly in current design since value in enum mem_type are
> > not sequential numbers. However, this can be done using something like this:
> 
> Ok, I see now. This is because I asked to make them bit fields
> before, shame on me. There is another option - use `32 - bit_ctz_u32()`
> to get a number from [1, 13] range and use it as an index in a small
> array. The problem here is that this is a bit crazy and I can't be sure
> if it works faster than this switch-case on all platforms. Hence, lets
> leave it as is now then.
> 
> > diff --git a/src/box/sql/vdbe.c b/src/box/sql/vdbe.c
> > index 32d02d96e..220e8b269 100644
> > --- a/src/box/sql/vdbe.c
> > +++ b/src/box/sql/vdbe.c
> > @@ -1828,7 +1828,7 @@ case OP_Compare: {
> >  		assert(i < (int)def->part_count);
> >  		struct coll *coll = def->parts[i].coll;
> >  		bool is_rev = def->parts[i].sort_order == SORT_ORDER_DESC;
> > -		iCompare = sqlMemCompare(&aMem[p1+idx], &aMem[p2+idx], coll);
> > +		mem_cmp_scalar(&aMem[p1+idx], &aMem[p2+idx], &iCompare, coll);
> 
> Why don't you check the result here? AFAIU, previously
> sqlMemCompare() never returned something undefined. Now iCompare
> might be left garbage leading to unstable behaviour. The same
> below.
> 
Fixed. Sorry, I didn't think about this last time, I should have fixed this in
all places.

> >  		if (iCompare) {
> >  			if (is_rev)
> >  				iCompare = -iCompare;
> > diff --git a/src/box/sql/where.c b/src/box/sql/where.c
> > index e5f35fbf8..dadc6d4a2 100644
> > --- a/src/box/sql/where.c
> > +++ b/src/box/sql/where.c
> > @@ -1272,12 +1272,14 @@ whereRangeSkipScanEst(Parse * pParse,		/* Parsing & code generating context */
> >  			rc = sql_stat4_column(db, samples[i].sample_key, nEq,
> >  					      &pVal);
> >  			if (rc == 0 && p1 != NULL) {
> > -				int res = sqlMemCompare(p1, pVal, coll);
> > +				int res;
> > +				mem_cmp_scalar(p1, pVal, &res, coll);
> >  				if (res >= 0)
> >  					nLower++;
> >  			}
> >  			if (rc == 0 && p2 != NULL) {
> > -				int res = sqlMemCompare(p2, pVal, coll);
> > +				int res;
> > +				mem_cmp_scalar(p2, pVal, &res, coll);
> >  				if (res >= 0)
> >  					nUpper++;
> >  			}


Diff:

diff --git a/src/box/sql/vdbe.c b/src/box/sql/vdbe.c
index 220e8b269..d322caef9 100644
--- a/src/box/sql/vdbe.c
+++ b/src/box/sql/vdbe.c
@@ -1828,7 +1828,13 @@ case OP_Compare: {
 		assert(i < (int)def->part_count);
 		struct coll *coll = def->parts[i].coll;
 		bool is_rev = def->parts[i].sort_order == SORT_ORDER_DESC;
-		mem_cmp_scalar(&aMem[p1+idx], &aMem[p2+idx], &iCompare, coll);
+		struct Mem *a = &aMem[p1+idx];
+		struct Mem *b = &aMem[p2+idx];
+		if (mem_cmp_scalar(a, b, &iCompare, coll) != 0) {
+			diag_set(ClientError, ER_SQL_TYPE_MISMATCH, mem_str(b),
+				 mem_type_to_str(a));
+			goto abort_due_to_error;
+		}
 		if (iCompare) {
 			if (is_rev)
 				iCompare = -iCompare;
diff --git a/src/box/sql/where.c b/src/box/sql/where.c
index dadc6d4a2..e2eb153fb 100644
--- a/src/box/sql/where.c
+++ b/src/box/sql/where.c
@@ -1273,14 +1273,26 @@ whereRangeSkipScanEst(Parse * pParse,		/* Parsing & code generating context */
 					      &pVal);
 			if (rc == 0 && p1 != NULL) {
 				int res;
-				mem_cmp_scalar(p1, pVal, &res, coll);
-				if (res >= 0)
+				rc = mem_cmp_scalar(p1, pVal, &res, coll);
+				if (rc != 0) {
+					diag_set(ClientError,
+						 ER_SQL_TYPE_MISMATCH,
+						 mem_str(pVal),
+						 mem_type_to_str(p1));
+				}
+				if (rc == 0 && res >= 0)
 					nLower++;
 			}
 			if (rc == 0 && p2 != NULL) {
 				int res;
-				mem_cmp_scalar(p2, pVal, &res, coll);
-				if (res >= 0)
+				rc = mem_cmp_scalar(p2, pVal, &res, coll);
+				if (rc != 0) {
+					diag_set(ClientError,
+						 ER_SQL_TYPE_MISMATCH,
+						 mem_str(pVal),
+						 mem_type_to_str(p2));
+				}
+				if (rc == 0 && res >= 0)
 					nUpper++;
 			}
 		}


New patch:

commit e17481d82926fb47b60eb6aefd2fa2110c1baa09
Author: Mergen Imeev <imeevma@gmail.com>
Date:   Sat Jul 10 13:56:39 2021 +0300

    sql: introduce mem_cmp_scalar()
    
    This patch introduces the mem_cmp_scalar() function that compares two
    MEMs using SCALAR rules. MEMs must be scalars. Prior to this patch, there was a
    function that used SCALAR rules to compare two MEMs, but its design became
    overly complex as new types appeared.
    
    Part of #6164

diff --git a/src/box/sql/func.c b/src/box/sql/func.c
index aa565277c..efb14f23e 100644
--- a/src/box/sql/func.c
+++ b/src/box/sql/func.c
@@ -144,11 +144,16 @@ minmaxFunc(sql_context * context, int argc, sql_value ** argv)
 	for (i = 1; i < argc; i++) {
 		if (mem_is_null(argv[i]))
 			return;
-		if ((sqlMemCompare(argv[iBest], argv[i], pColl) ^ mask) >=
-		    0) {
-			testcase(mask == 0);
-			iBest = i;
+		int res;
+		if (mem_cmp_scalar(argv[iBest], argv[i], &res, pColl) != 0) {
+			diag_set(ClientError, ER_SQL_TYPE_MISMATCH,
+				 mem_str(argv[i]),
+				 mem_type_to_str(argv[iBest]));
+			context->is_aborted = true;
+			return;
 		}
+		if ((res ^ mask) >= 0)
+			iBest = i;
 	}
 	sql_result_value(context, argv[iBest]);
 }
@@ -1057,9 +1062,15 @@ nullifFunc(sql_context * context, int NotUsed, sql_value ** argv)
 {
 	struct coll *pColl = sqlGetFuncCollSeq(context);
 	UNUSED_PARAMETER(NotUsed);
-	if (sqlMemCompare(argv[0], argv[1], pColl) != 0) {
-		sql_result_value(context, argv[0]);
+	int res;
+	if (mem_cmp_scalar(argv[0], argv[1], &res, pColl) != 0) {
+		diag_set(ClientError, ER_SQL_TYPE_MISMATCH,
+			 mem_str(argv[1]), mem_type_to_str(argv[0]));
+		context->is_aborted = true;
+		return;
 	}
+	if (res != 0)
+		sql_result_value(context, argv[0]);
 }
 
 /**
@@ -1827,7 +1838,12 @@ minmaxStep(sql_context * context, int NotUsed, sql_value ** argv)
 		 * comparison is inverted.
 		 */
 		bool is_max = (func->flags & SQL_FUNC_MAX) != 0;
-		cmp = sqlMemCompare(pBest, pArg, pColl);
+		if (mem_cmp_scalar(pBest, pArg, &cmp, pColl) != 0) {
+			diag_set(ClientError, ER_SQL_TYPE_MISMATCH,
+				 mem_str(pArg), mem_type_to_str(pBest));
+			context->is_aborted = true;
+			return;
+		}
 		if ((is_max && cmp < 0) || (!is_max && cmp > 0)) {
 			mem_copy(pBest, pArg);
 		} else {
diff --git a/src/box/sql/mem.c b/src/box/sql/mem.c
index 2595e2fd4..da27cd191 100644
--- a/src/box/sql/mem.c
+++ b/src/box/sql/mem.c
@@ -59,6 +59,44 @@ enum {
 	BUF_SIZE = 32,
 };
 
+/**
+ * Analogue of enum mp_class for enum mp_type. The order of the classes must be
+ * the same as in the enum mp_class.
+ */
+enum mem_class {
+	MEM_CLASS_NULL,
+	MEM_CLASS_BOOL,
+	MEM_CLASS_NUMBER,
+	MEM_CLASS_STR,
+	MEM_CLASS_BIN,
+	MEM_CLASS_UUID,
+	mem_class_max,
+};
+
+static inline enum mem_class
+mem_type_class(enum mem_type type)
+{
+	switch (type) {
+	case MEM_TYPE_NULL:
+		return MEM_CLASS_NULL;
+	case MEM_TYPE_UINT:
+	case MEM_TYPE_INT:
+	case MEM_TYPE_DOUBLE:
+		return MEM_CLASS_NUMBER;
+	case MEM_TYPE_STR:
+		return MEM_CLASS_STR;
+	case MEM_TYPE_BIN:
+		return MEM_CLASS_BIN;
+	case MEM_TYPE_BOOL:
+		return MEM_CLASS_BOOL;
+	case MEM_TYPE_UUID:
+		return MEM_CLASS_UUID;
+	default:
+		break;
+	}
+	return mem_class_max;
+}
+
 bool
 mem_is_field_compatible(const struct Mem *mem, enum field_type type)
 {
@@ -2009,6 +2047,36 @@ mem_cmp_uuid(const struct Mem *a, const struct Mem *b, int *result)
 	return 0;
 }
 
+int
+mem_cmp_scalar(const struct Mem *a, const struct Mem *b, int *result,
+	       const struct coll *coll)
+{
+	enum mem_class class_a = mem_type_class(a->type);
+	enum mem_class class_b = mem_type_class(b->type);
+	if (class_a != class_b) {
+		*result = class_a - class_b;
+		return 0;
+	}
+	switch (class_a) {
+	case MEM_CLASS_NULL:
+		*result = 0;
+		return 0;
+	case MEM_CLASS_BOOL:
+		return mem_cmp_bool(a, b, result);
+	case MEM_CLASS_NUMBER:
+		return mem_cmp_num(a, b, result);
+	case MEM_CLASS_STR:
+		return mem_cmp_str(a, b, result, coll);
+	case MEM_CLASS_BIN:
+		return mem_cmp_bin(a, b, result);
+	case MEM_CLASS_UUID:
+		return mem_cmp_uuid(a, b, result);
+	default:
+		unreachable();
+	}
+	return 0;
+}
+
 /*
  * Both *pMem1 and *pMem2 contain string values. Compare the two values
  * using the collation sequence pColl. As usual, return a negative , zero
@@ -2440,82 +2508,6 @@ sqlVdbeMemTooBig(Mem * p)
 	return 0;
 }
 
-/*
- * Compare the values contained by the two memory cells, returning
- * negative, zero or positive if pMem1 is less than, equal to, or greater
- * than pMem2. Sorting order is NULL's first, followed by numbers (integers
- * and reals) sorted numerically, followed by text ordered by the collating
- * sequence pColl and finally blob's ordered by memcmp().
- *
- * Two NULL values are considered equal by this function.
- */
-int
-sqlMemCompare(const Mem * pMem1, const Mem * pMem2, const struct coll * pColl)
-{
-	int res;
-
-	enum mem_type type1 = pMem1->type;
-	enum mem_type type2 = pMem2->type;
-
-	/* If one value is NULL, it is less than the other. If both values
-	 * are NULL, return 0.
-	 */
-	if (((type1 | type2) & MEM_TYPE_NULL) != 0)
-		return (int)(type2 == MEM_TYPE_NULL) -
-		       (int)(type1 == MEM_TYPE_NULL);
-
-	if (((type1 | type2) & MEM_TYPE_BOOL) != 0) {
-		if ((type1 & type2 & MEM_TYPE_BOOL) != 0) {
-			if (pMem1->u.b == pMem2->u.b)
-				return 0;
-			if (pMem1->u.b)
-				return 1;
-			return -1;
-		}
-		if (type2 == MEM_TYPE_BOOL)
-			return +1;
-		return -1;
-	}
-
-	if (((type1 | type2) & MEM_TYPE_UUID) != 0) {
-		if (mem_cmp_uuid(pMem1, pMem2, &res) == 0)
-			return res;
-		if (type1 != MEM_TYPE_UUID)
-			return +1;
-		return -1;
-	}
-
-	/* At least one of the two values is a number
-	 */
-	if (((type1 | type2) &
-	     (MEM_TYPE_INT | MEM_TYPE_UINT | MEM_TYPE_DOUBLE)) != 0) {
-		if (!mem_is_num(pMem1))
-			return +1;
-		if (!mem_is_num(pMem2))
-			return -1;
-		mem_cmp_num(pMem1, pMem2, &res);
-		return res;
-	}
-
-	/* If one value is a string and the other is a blob, the string is less.
-	 * If both are strings, compare using the collating functions.
-	 */
-	if (((type1 | type2) & MEM_TYPE_STR) != 0) {
-		if (type1 != MEM_TYPE_STR) {
-			return 1;
-		}
-		if (type2 != MEM_TYPE_STR) {
-			return -1;
-		}
-		mem_cmp_str(pMem1, pMem2, &res, pColl);
-		return res;
-	}
-
-	/* Both values must be blobs.  Compare using memcmp().  */
-	mem_cmp_bin(pMem1, pMem2, &res);
-	return res;
-}
-
 int
 sql_vdbemem_finalize(struct Mem *mem, struct func *func)
 {
diff --git a/src/box/sql/mem.h b/src/box/sql/mem.h
index b3cd5c545..bbb99c4d2 100644
--- a/src/box/sql/mem.h
+++ b/src/box/sql/mem.h
@@ -696,6 +696,14 @@ mem_cmp_num(const struct Mem *a, const struct Mem *b, int *result);
 int
 mem_cmp_uuid(const struct Mem *left, const struct Mem *right, int *result);
 
+/**
+ * Compare two MEMs using SCALAR rules and return the result of comparison. MEMs
+ * should be scalars. Original MEMs are not changed.
+ */
+int
+mem_cmp_scalar(const struct Mem *a, const struct Mem *b, int *result,
+	       const struct coll *coll);
+
 /**
  * Convert the given MEM to INTEGER. This function and the function below define
  * the rules that are used to convert values of all other types to INTEGER. In
@@ -961,8 +969,6 @@ int sqlVdbeMemTooBig(Mem *);
 #define VdbeMemDynamic(X) (((X)->flags & MEM_Dyn) != 0 ||\
 			   ((X)->type & (MEM_TYPE_AGG | MEM_TYPE_FRAME)) != 0)
 
-int sqlMemCompare(const Mem *, const Mem *, const struct coll *);
-
 /** MEM manipulate functions. */
 
 /**
diff --git a/src/box/sql/vdbe.c b/src/box/sql/vdbe.c
index 32d02d96e..d322caef9 100644
--- a/src/box/sql/vdbe.c
+++ b/src/box/sql/vdbe.c
@@ -1828,7 +1828,13 @@ case OP_Compare: {
 		assert(i < (int)def->part_count);
 		struct coll *coll = def->parts[i].coll;
 		bool is_rev = def->parts[i].sort_order == SORT_ORDER_DESC;
-		iCompare = sqlMemCompare(&aMem[p1+idx], &aMem[p2+idx], coll);
+		struct Mem *a = &aMem[p1+idx];
+		struct Mem *b = &aMem[p2+idx];
+		if (mem_cmp_scalar(a, b, &iCompare, coll) != 0) {
+			diag_set(ClientError, ER_SQL_TYPE_MISMATCH, mem_str(b),
+				 mem_type_to_str(a));
+			goto abort_due_to_error;
+		}
 		if (iCompare) {
 			if (is_rev)
 				iCompare = -iCompare;
diff --git a/src/box/sql/where.c b/src/box/sql/where.c
index e5f35fbf8..e2eb153fb 100644
--- a/src/box/sql/where.c
+++ b/src/box/sql/where.c
@@ -1272,13 +1272,27 @@ whereRangeSkipScanEst(Parse * pParse,		/* Parsing & code generating context */
 			rc = sql_stat4_column(db, samples[i].sample_key, nEq,
 					      &pVal);
 			if (rc == 0 && p1 != NULL) {
-				int res = sqlMemCompare(p1, pVal, coll);
-				if (res >= 0)
+				int res;
+				rc = mem_cmp_scalar(p1, pVal, &res, coll);
+				if (rc != 0) {
+					diag_set(ClientError,
+						 ER_SQL_TYPE_MISMATCH,
+						 mem_str(pVal),
+						 mem_type_to_str(p1));
+				}
+				if (rc == 0 && res >= 0)
 					nLower++;
 			}
 			if (rc == 0 && p2 != NULL) {
-				int res = sqlMemCompare(p2, pVal, coll);
-				if (res >= 0)
+				int res;
+				rc = mem_cmp_scalar(p2, pVal, &res, coll);
+				if (rc != 0) {
+					diag_set(ClientError,
+						 ER_SQL_TYPE_MISMATCH,
+						 mem_str(pVal),
+						 mem_type_to_str(p2));
+				}
+				if (rc == 0 && res >= 0)
 					nUpper++;
 			}
 		}
diff --git a/test/sql-tap/gh-6164-uuid-follow-ups.test.lua b/test/sql-tap/gh-6164-uuid-follow-ups.test.lua
index 4fc5052d8..6b4a811c3 100755
--- a/test/sql-tap/gh-6164-uuid-follow-ups.test.lua
+++ b/test/sql-tap/gh-6164-uuid-follow-ups.test.lua
@@ -1,6 +1,6 @@
 #!/usr/bin/env tarantool
 local test = require("sqltester")
-test:plan(4)
+test:plan(8)
 
 -- Make sure that function quote() can work with uuid.
 test:do_execsql_test(
@@ -35,4 +35,47 @@ test:do_test(
     end,
     uuid3)
 
+--
+-- Make sure a comparison that includes a UUID and follows the SCALAR rules is
+-- working correctly.
+--
+box.execute([[CREATE TABLE t (i INTEGER PRIMARY KEY, s SCALAR);]])
+box.execute([[INSERT INTO t VALUES (1, ?)]], {uuid1})
+
+test:do_execsql_test(
+    "gh-6164-5",
+    [[
+        SELECT GREATEST(i, s, x'33', 'something') FROM t;
+    ]], {
+        uuid1
+    })
+
+test:do_execsql_test(
+    "gh-6164-6",
+    [[
+        SELECT LEAST(i, s, x'33', 'something') FROM t;
+    ]], {
+        1
+    })
+
+box.execute([[INSERT INTO t VALUES (2, 2);]])
+
+test:do_execsql_test(
+    "gh-6164-7",
+    [[
+        SELECT MAX(s) FROM t;
+    ]], {
+        uuid1
+    })
+
+test:do_execsql_test(
+    "gh-6164-8",
+    [[
+        SELECT MIN(s) FROM t;
+    ]], {
+        2
+    })
+
+box.execute([[DROP TABLE t;]])
+
 test:finish_test()

  reply	other threads:[~2021-07-13  8:04 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-10 14:33 [Tarantool-patches] [PATCH v2 0/4] Follow ups for uuid introduction Mergen Imeev via Tarantool-patches
2021-07-10 14:33 ` [Tarantool-patches] [PATCH v2 1/4] sql: introduce uuid to quote() Mergen Imeev via Tarantool-patches
2021-07-10 14:33 ` [Tarantool-patches] [PATCH v2 2/4] sql: allow to bind uuid values Mergen Imeev via Tarantool-patches
2021-07-10 14:33 ` [Tarantool-patches] [PATCH v2 3/4] sql: introduce mem_cmp_scalar() Mergen Imeev via Tarantool-patches
2021-07-11 15:03   ` Vladislav Shpilevoy via Tarantool-patches
2021-07-11 17:51     ` Mergen Imeev via Tarantool-patches
2021-07-12 21:06       ` Vladislav Shpilevoy via Tarantool-patches
2021-07-13  8:04         ` Mergen Imeev via Tarantool-patches [this message]
2021-07-10 14:33 ` [Tarantool-patches] [PATCH v2 4/4] sql: introduce mem_cmp_msgpack() Mergen Imeev via Tarantool-patches
2021-07-11 15:05   ` Vladislav Shpilevoy via Tarantool-patches
2021-07-11 17:59     ` Mergen Imeev via Tarantool-patches
2021-07-12 21:09       ` Vladislav Shpilevoy via Tarantool-patches
2021-07-13  8:10         ` Mergen Imeev via Tarantool-patches
2021-07-13 20:39           ` Vladislav Shpilevoy via Tarantool-patches
2021-07-14  6:51             ` Mergen Imeev via Tarantool-patches
2021-07-14 21:53               ` Vladislav Shpilevoy via Tarantool-patches
2021-07-15  6:58                 ` Mergen Imeev via Tarantool-patches
2021-07-15 20:44 ` [Tarantool-patches] [PATCH v2 0/4] Follow ups for uuid introduction Vladislav Shpilevoy via Tarantool-patches
2021-07-16  8:57 Mergen Imeev via Tarantool-patches
2021-07-16  8:57 ` [Tarantool-patches] [PATCH v2 3/4] sql: introduce mem_cmp_scalar() Mergen Imeev via Tarantool-patches
2021-07-19  9:17   ` Timur Safin via Tarantool-patches

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Tarantool development patches archive

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://lists.tarantool.org/tarantool-patches/0 tarantool-patches/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 tarantool-patches tarantool-patches/ https://lists.tarantool.org/tarantool-patches \
		tarantool-patches@dev.tarantool.org.
	public-inbox-index tarantool-patches

Example config snippet for mirrors.


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git